Her interview with the programme has prompted US authorities to launch a criminal investigation and in late December agents flew the teenager to the United States for a full interview after Channel 4 News alerted authorities.

Maria was 16-years-old when she was lured into the gang by a young man on the streets of the deadly Mexican border town of Ciudad Juarez.

She said she had been given presents and promised a job in an office by the gang member but was instead drugged and raped and sold to men. She explained what the gang did to one girl who tried to escape.

“They took a gallon of gasoline and started pouring it over her,” said Maria.

“One of the men told me ‘if you don’t do as I say I will do the same to you’. I wanted to look away – but they didn’t let me.

“Even though the girl was on fire they kept hitting her. They were laughing as if they were enjoying what they were doing.

“They burnt her alive.”

Maria, which is not her real name, said the gang held young women in a house on the Mexican border until they were sold to the US as sex slaves. But she said they also dealt in children and told of on one occasion when the gang was contacted by a woman in New York.

“She called and was very angry. She said she needed a seven-year-old girl and a nine-year-old boy – and she needed them in three days.”

Maria told Special Agents that the gang would prowl the streets of poor areas and look for children.

“They stole the children,” she said. “One of the gang members took a six-year-old kid. I had to look after him for three hours. He told me he wanted to see his mummy.

“Then I started crying, I said: “I don’t think you’re ever going to see your mummy again.” All he kept saying was I want to see my mummy.”

US officials have a keen interest in this case. As a result of the interview US officials have begun investigating along with the Mexican authorities.

Maria, who managed to escape after a gang member left her alone in a house, says children were often around. But not for long.

“I saw the Americans taking kids,” she said. “A four-year-old and another boy, he barely walked, he was only about two years old. They took them to New York.”

The US State Department estimates that more than 20,000 young women and children are trafficked across the border from Mexico each year. But conviction rates remain low.

Mexico’s Attorney General Arturo Chavez has been accused of not doing enough to bring human traffickers to justice but insisted it was an issue the country was “definitely focussing on.”

Maria has been told that she could have to give evidence against the gang of they are caught. It is something she says she is determined to do.

“Women are sold, they are abducted, bought and even killed by these men. If these men are ever found, jail won’t be enough to make them pay for the way they’ve made us feel.”